Carbureter



c. R. GREUTER.

CARBURETER.

APPLICATION FELED FEB. 23. 1917.

Patented A11 24, 1920.

2 SHEETS-SHEET 2.

fj'rwwfloz CHARLES R GREU TE'R attorney! PATENT OFFICE.

CHARLES R. GREUTER, OF CINCINNATI, OHIO.

CARBURETER.

- Application filed February 23, 1917.

To all whom it may concern:

Be it known that I, CHARLES R. GREUTER, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Carbureters, of which the following is a specification.

This invention relates to carbureters and particularly to an air inlet control valve mechanism, suited particularlyfor use with jet carburetors.

Broadly stated, the invention involves the use of a loaded, suction-opened, air valve in advance of the jet, together with means for adjusting the normal or idling position of the valve to preserve a definite areaof opening, and means manually operable to shift the valve to a so-called starting position in which the area of opening is greatly restricted.

Another important feature is the use of an air-- assage flaring or increasing in diameter in t e direction of flow of air therethrough in conjunction with a conical air valve which produces a nicely graduated lifting action upon the valve as the engine increases its speed from idling operation. 7

I illustrate the invention applied to a jet carbureter of conventional form in the accompanying drawings, in which Figure l is a longitudinal section through the complete carburetor;

Fig. 2 is a section through the suction air valve in starting position;

Fig. 3 is a section on the line 3-8 of Fi 2;

Fig. 4 is a view, similar to Fig. 2, showing the inlet valve in high speed position; and

Fig. 5 is a fragmentary perspective of the depressor for moving the inlet valve to starting position.

n the accompanying drawings, 6 is the gasolene feed pipe, 7 is the float cup, 8 is the jet nozzle, 9 is the needle valve for adjusting the jet, 10 is the Venturi tube and 11 is the throttle. These parts are of any usual form and are subject to modification within wide limits. The carbureter is attached to the engine intake by a flange 12 and the throttle is operated to control the feed of carbureted air to the engine by a lever 13.

Specification of Letters Patent.

limits its downward movement.

Patented Aug. 24, 1920. Serial No. 150,415.

Communicating with the inlet end of the Venturi tube 10 is the air inlet valve chamber 14 with a circular inlet passage 15 at its lower side. Vithin this passage 15 is a rim 16 forming a contracted opening flaring on its upper face as indicated at 17 This flaring surface 17 makes an angle of about 30 with the axis of the inlet passage.

Axially alined with inlet passage 15 is a stem or guide 18 which is slidably mounted in a sleeve 19. The sleeve 19 is threaded into the wall of chamber 141 opposite to the pas sage 15 so as to be adjustable toward and from said passage. A slot 20'and clamp screw 21 permit it-to be clamped in its adjusted positions. The stem 18 has a shoulder 22 which normally is held against the lower end of sleeve 19 by a spring 23 confined between the nut 24 and the upper end of the sleeve 19.

Slidably mounted on the guide stem 18 is a weighted valve 25 having a conical lower face 26 merging into a rounded or filleted edge or periphery. The valve 25 is retained on guide stem 18 by a conical head 27 which It is free to move upward on stem 18 until it strikes sleeve 22 and at high engine speeds assumes this position, which is the one shown in Fig. 1. I

The low speed or idling position is indicated in Fig. 1, the valve then resting against the head 27 and nearly closing the inlet passage. The idling adjustment is made, after proper adjustment of the needle valve, by turning sleeve 19 to adjust the vertical position of head 27 on stem 18.

For starting the engine a heavier suction on the jet is desired and I secure this by forcing valve 25 down to the position shown in Fig. 2, in which the valve practically but not completely closes the air inlet as it does not seat therein. An arm 28 is fast on a shaft 29, mounted in chamber 14, and projects out over valve 25 to one side of stem 18. The shaft 29 and arm 28 may be actuated by a manually operable lever 30, the arm 28 being normally held up out of the path of valve 25 by a coil spring 31. By swinging the arm 30 the arm 28 is caused to swing downward and engage valve 25. Since the valve 25 rests against head 27 the stem 18 is drawn down, compressing spring 23, so that the downward movement of stem 18 permits valve 25 to move downward past its idling position which is normally the lower limit of its motion.

7 Referring particularly to Fig. 1, it will be observed that the conical flare 17, on rim 16, and the conical lower face 26 of valve 25 merging into a rounded periphery are so coordinated that abrupt changes in the cross-sectional area of the air passage around the valve are avoided. This is true in allpositions of the valve, and practically eliminates any tendency to flutter avoids the formation of eddies. The valve is opened by suction, but is steadied by the stream flow around it, this stream flow being confined between opposed'and approximately parallel faces of the valve and casing. As'the valve opens, the area of the flow passage 1s increased, but at the same ,time the path of flow between the opposed faces of the valve and casing is lengthened (compare Figs. 1 and 4) so that the steady ing action persists. V I

While I regard this improved action as primarily due to the opposed conical surfaces it is to be noted that the rounded periphery of the valve is a feature which avoids sudden changes of direction of air flow and conduces to smooth operation by causing an increase of the opposed inclined surfaces as the valve lifts.

Having thus'described invention, what Iclaim is: I I

1. A SLlCtlQ11LClJL1fLtGC1 air admission valve for carbureters, comprising a shell having an air admission port widening gradually in thedirection of the flow of air; a valve having a flaring or conical outer face dimensioned to substantially fill at its periphery the most contracted portion of said air admission port; a guide for directing said valve toward and inward from said contracted portion of the admission port; and means for urging said valve toward said contracted portion with a force substantially constant throughout the range of valve movement.

2. A suction-actuatcd air admission valve for carburetors, comprising a shell having an air admission port widening gradually in the direction of the flow of air ;..a valve h aving a flaring or conical outerface dimensioned. to substantially fill at its periphery the most contracted portion of said air admission port; a guide for directing said valve toward and ,inward from said contracted portion of the admission port; and means for urging said valve toward said contracted portion with a force substan tially constant throughout the range of valve movement, the, entire outer face of said valve being exposed to the in-fiowing 311'.

because it portion of said admission port; and a guide and limit stops for directing said valve in a limlted vertical movement inward and upward from saidc'ontracted portion of the air port. 7

4. A suction-actuated air inlet valve for carbureters, comprising a shell having an admission port flaring or widening in the direction of the flow of air therethrough; a weighted valve having a flaring or conical outer face and dimensioned substantially to fill at its periphery the most contracted portion of said admission port; a guide and limit stops for directing said valve in a limited inward and upward movement from said contracted portion of said port; and means for adjusting the lower limit stop to determinethe normal or idling position of said valve.

5. A suctionkactuated air inlet valve for carbureters, comprising a shell having an admission port flaring or widening in the direction of the flow of air through it; a weighted valve having a flaring or conical outer face dimensioned substantially to fill at its periphery the most contracted portion of the admission port; a guide for directing said valve in movements inward from the contracted portion of said port; a yielding limit stop limiting the downward movement of said valve and capable of supporting the weight of said valve; and manually operable means'for shifting said valve to a lower position by overpowering said limit stop.

6. A suction-actuated air inlet valve for carbureters,comprising a shell or casing having an admission port flaring or widening in the direction of the flow of air through it; a weighted valve having a flaring or conical outer face and dimensioned substantially to fill at its periphery the most contracted portion of the admission port; a guide for directing said valve in movements inward from the contracted portion of said port; a yielding limit stop limiting the outward movement of said valve and capable of supporting the weight of said valve; means for adjusting the normal position of said limit stop; and manually operable means for shifting said valve to a lower position by overpowering said stop..

manually operable means adapted to engage said valve and shift the latter to an abhor 10 Inal position by shifting said stem against the opposition of said spring.

In" testimony whereof I have signed my name to this specification.

CHARLES R. GREUTER. 

